1. Can it manage high poly characters?2. Can it support RTS?3. What format does it use regarding models?

We are looking to make our game soon as possible, however, we don't have an coder to assist us, although we are 3 ppl, Me & two artist. If we get a coder we will be well off, we have all the skills then to pull of this project.

Yes and no. The Krystal animated model has 16 000 triangles and runs at few hundred FPS on my machine. The problem is however that all computations are still made in software while it should be made through hardware. That's one of the topic I expect to work on in the incoming months.

Why not? Frank and Mike have worked recently on various improvements of the shaders for the terrain system. It looks really great now and would be a good start for your RTS, along with the water shaders, the foliage and the Level of Details systems.

CS has its own XML compliant format. You can import your models into this format through the corresponding scripts of Blender, 3DS max and Maya. CS has also an importer to read directly data from the COLLADA file format.